xref: /linux/drivers/gpu/drm/msm/hdmi/hdmi_phy_8x60.c (revision c8afe684c95cd17cf4f273d81af369a0fdfa5a74)

/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "hdmi.h"

struct hdmi_phy_8x60 {
	struct hdmi_phy base;
	struct hdmi *hdmi;
};
#define to_hdmi_phy_8x60(x) container_of(x, struct hdmi_phy_8x60, base)

static void hdmi_phy_8x60_destroy(struct hdmi_phy *phy)
{
	struct hdmi_phy_8x60 *phy_8x60 = to_hdmi_phy_8x60(phy);
	kfree(phy_8x60);
}

static void hdmi_phy_8x60_reset(struct hdmi_phy *phy)
{
	struct hdmi_phy_8x60 *phy_8x60 = to_hdmi_phy_8x60(phy);
	struct hdmi *hdmi = phy_8x60->hdmi;
	unsigned int val;

	val = hdmi_read(hdmi, REG_HDMI_PHY_CTRL);

	if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
		/* pull low */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val & ~HDMI_PHY_CTRL_SW_RESET);
	} else {
		/* pull high */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val | HDMI_PHY_CTRL_SW_RESET);
	}

	msleep(100);

	if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
		/* pull high */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val | HDMI_PHY_CTRL_SW_RESET);
	} else {
		/* pull low */
		hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
				val & ~HDMI_PHY_CTRL_SW_RESET);
	}
}

static void hdmi_phy_8x60_powerup(struct hdmi_phy *phy,
		unsigned long int pixclock)
{
	struct hdmi_phy_8x60 *phy_8x60 = to_hdmi_phy_8x60(phy);
	struct hdmi *hdmi = phy_8x60->hdmi;

	/* De-serializer delay D/C for non-lbk mode: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG0,
			HDMI_8x60_PHY_REG0_DESER_DEL_CTRL(3));

	if (pixclock == 27000000) {
		/* video_format == HDMI_VFRMT_720x480p60_16_9 */
		hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG1,
				HDMI_8x60_PHY_REG1_DTEST_MUX_SEL(5) |
				HDMI_8x60_PHY_REG1_OUTVOL_SWING_CTRL(3));
	} else {
		hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG1,
				HDMI_8x60_PHY_REG1_DTEST_MUX_SEL(5) |
				HDMI_8x60_PHY_REG1_OUTVOL_SWING_CTRL(4));
	}

	/* No matter what, start from the power down mode: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG2,
			HDMI_8x60_PHY_REG2_PD_PWRGEN |
			HDMI_8x60_PHY_REG2_PD_PLL |
			HDMI_8x60_PHY_REG2_PD_DRIVE_4 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_3 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_2 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_1 |
			HDMI_8x60_PHY_REG2_PD_DESER);

	/* Turn PowerGen on: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG2,
			HDMI_8x60_PHY_REG2_PD_PLL |
			HDMI_8x60_PHY_REG2_PD_DRIVE_4 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_3 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_2 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_1 |
			HDMI_8x60_PHY_REG2_PD_DESER);

	/* Turn PLL power on: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG2,
			HDMI_8x60_PHY_REG2_PD_DRIVE_4 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_3 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_2 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_1 |
			HDMI_8x60_PHY_REG2_PD_DESER);

	/* Write to HIGH after PLL power down de-assert: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG3,
			HDMI_8x60_PHY_REG3_PLL_ENABLE);

	/* ASIC power on; PHY REG9 = 0 */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG9, 0);

	/* Enable PLL lock detect, PLL lock det will go high after lock
	 * Enable the re-time logic
	 */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG12,
			HDMI_8x60_PHY_REG12_RETIMING_EN |
			HDMI_8x60_PHY_REG12_PLL_LOCK_DETECT_EN);

	/* Drivers are on: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG2,
			HDMI_8x60_PHY_REG2_PD_DESER);

	/* If the RX detector is needed: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG2,
			HDMI_8x60_PHY_REG2_RCV_SENSE_EN |
			HDMI_8x60_PHY_REG2_PD_DESER);

	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG4, 0);
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG5, 0);
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG6, 0);
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG7, 0);
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG8, 0);
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG9, 0);
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG10, 0);
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG11, 0);

	/* If we want to use lock enable based on counting: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG12,
			HDMI_8x60_PHY_REG12_RETIMING_EN |
			HDMI_8x60_PHY_REG12_PLL_LOCK_DETECT_EN |
			HDMI_8x60_PHY_REG12_FORCE_LOCK);
}

static void hdmi_phy_8x60_powerdown(struct hdmi_phy *phy)
{
	struct hdmi_phy_8x60 *phy_8x60 = to_hdmi_phy_8x60(phy);
	struct hdmi *hdmi = phy_8x60->hdmi;

	/* Assert RESET PHY from controller */
	hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
			HDMI_PHY_CTRL_SW_RESET);
	udelay(10);
	/* De-assert RESET PHY from controller */
	hdmi_write(hdmi, REG_HDMI_PHY_CTRL, 0);
	/* Turn off Driver */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG2,
			HDMI_8x60_PHY_REG2_PD_DRIVE_4 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_3 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_2 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_1 |
			HDMI_8x60_PHY_REG2_PD_DESER);
	udelay(10);
	/* Disable PLL */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG3, 0);
	/* Power down PHY, but keep RX-sense: */
	hdmi_write(hdmi, REG_HDMI_8x60_PHY_REG2,
			HDMI_8x60_PHY_REG2_RCV_SENSE_EN |
			HDMI_8x60_PHY_REG2_PD_PWRGEN |
			HDMI_8x60_PHY_REG2_PD_PLL |
			HDMI_8x60_PHY_REG2_PD_DRIVE_4 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_3 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_2 |
			HDMI_8x60_PHY_REG2_PD_DRIVE_1 |
			HDMI_8x60_PHY_REG2_PD_DESER);
}

static const struct hdmi_phy_funcs hdmi_phy_8x60_funcs = {
		.destroy = hdmi_phy_8x60_destroy,
		.reset = hdmi_phy_8x60_reset,
		.powerup = hdmi_phy_8x60_powerup,
		.powerdown = hdmi_phy_8x60_powerdown,
};

struct hdmi_phy *hdmi_phy_8x60_init(struct hdmi *hdmi)
{
	struct hdmi_phy_8x60 *phy_8x60;
	struct hdmi_phy *phy = NULL;
	int ret;

	phy_8x60 = kzalloc(sizeof(*phy_8x60), GFP_KERNEL);
	if (!phy_8x60) {
		ret = -ENOMEM;
		goto fail;
	}

	phy = &phy_8x60->base;

	phy->funcs = &hdmi_phy_8x60_funcs;

	phy_8x60->hdmi = hdmi;

	return phy;

fail:
	if (phy)
		hdmi_phy_8x60_destroy(phy);
	return ERR_PTR(ret);
}